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A possible explanation:
I am assuming you are pulling the HDD out of a Seagate enclosure. It looks like there may be some special firmware in the enclosure interface. See hereHow To Open a Seagate GoFlex Desk Hard Disk Drive Case
"But cracking them open isnít all that worthwhile, since the format requires the GoFlex Dock adapter."

@rolling7z, You have not given full details of your external case. Did you buy the external case separately and your 3TB HDD separately.? Or is it a branded external HDD like Western Digital My BooK/ Passport, Seagate expansion/Backup Plus etc.,and you have taken the HDD out of such a branded external drive?

It would appear that your 3TB HDD has been formatted by you. Did you format it inside the enclosure? Did you format it as an MBR drive or GPT drive?

Have you been using it inside the enclosure and was it OK? Do you have any data on it?

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